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Yes, it's an acid. Don't use the mild soaps, they just don't work for what I'd call a "clean" finish that looks like it just came out of the foundry. You need the acid to cut through the grime and oxidation.
Meguire's is a consumer product and isn't very strong. If you have access to professional detailing chemicals, the wire wheel cleaner from P&S works even faster, but you do have to watch it because the acid content is about 5x stronger. Obviously Meguire's isn't even strong enough to hurt the machined finish.
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